1 The equipment should conform to the provisions
of CCIR Recommendation 688 applicable to shipborne equipment and,
in addition, to the provisions given in the following paragraphs.
2 The equipment should be capable of producing
a printed copy of received information. The equipment functions should
include signal reception, processing, printing and the means to control
the frequency of the radio receiver both manually and automatically.
3 Details of the coverage areas and message categories
which have been excluded by the operator from reception should be
readily available.
4 The receiver should operate on the frequencies
prescribed by the Radio Regulations for the system.
5 The equipment should be provided with a facility
to test that the radio receiver, signal processor and printing device
are functioning correctly.
6 The equipment should be capable of internally
storing at least 255 message identifications. After between 60 and
72 h a message identification should automatically be erased from
the store. If the number of received message identifications exceeds
the capacity of the store, the oldest message identification should
be erased.
7 Only message identifications which have been
satisfactorily received should be stored; a message is satisfactorily
received if the character-error ratio is below 4%.
8 The receipt of search and rescue information
should give an alarm at the position from which the ship is normally
navigated. It should be possible only to reset this alarm manually.
9 Information for location (B1)footnote and message (B2)footnotedesignators in programmable memories should
not be erased by interruptions in the power supply of less than 6
h.
10 The receiver sensitivity should be equal to
or better than 6 μV e.m.f. at the receiver input to produce an
NBDP output character-error rate of not greater than 10-2.
11 The printing device should be able to print
at least 32 characters per line.
12 If automatic line feed entails division of
a word, this shall be indicated in the written text. The printing
device should automatically feed paper after completing the printed
message.
13 The equipment should print an asterisk if a
character is received mutilated.
14 A UTC clock, accurate to at least one second,
and associated with a reprogrammable memory which contains the frequency
sequence and UTC broadcast schedules of all stations, should control
the HF receiver to provide automatic MSI reception.